Units Period

Activity sources

Add runs from a connected service or from files on this device.

Strava Not connected

Connect to load your running history and check for new activities when you choose.

Connecting lets RunFit read your Strava activities, including private activities, to calculate RFI. Your activity data is stored only on this device and is not stored in RunFit's servers. Privacy details.

Import files

Bring in activity history exported from Strava, Garmin, or another provider.

Supports Strava activities.csv for fast estimated history, plus TCX/GPX files for detailed analysis. Files are processed in this browser and are not uploaded to RunFit.

RunFit Index (RFI) over time

All runs with a calculable RFI. First 10 minutes excluded.

Latest—

Best—

Goal—

Add activity data to build the chart.

Race goal

Select a distance and target finish time. Pace and required RFI are calculated for you.

Race distance Target completion time

: :

Expected race HR (% max)

Required pace—

Target time—

Required RFI—

Race %HR varies by athlete, heat, course, fatigue and measurement method. Treat the defaults as editable starting assumptions.

Analysis settings

Set the top of easy by HR or pace. Interval detection uses lap structure; the long-rep threshold only changes how interval RFI is calculated.

Max HR (bpm) Exclude first (minutes) Easy / steady breakpoint Top of easy (% max HR) Long-rep RFI threshold (minutes)

Runs

Select a refined run to review its laps. Pending runs use whole-activity averages until detailed analysis is complete; refined interval sessions use the configured short/long rep rules.

Date	Run	Distance	Category	Pace	RFI

No runs stored on this device yet. Add an activity source or import files to begin.

Workout laps

Automatic detection looks for repeated faster work laps separated by slower recovery laps, including short reps. Override any lap below.

Include	Lap	Time	Distance	Avg HR	%HR	Pace	RFI

Test mode: calculate all interval-session RFI like a steady run Classification remains Intervals; only the RFI, progress chart, and HR-vs-speed point use the whole post-warm-up run.